GB798948A - System for reproducing signals from a magnetic medium - Google Patents

System for reproducing signals from a magnetic medium

Info

Publication number
GB798948A
GB798948A GB12214/55A GB1221455A GB798948A GB 798948 A GB798948 A GB 798948A GB 12214/55 A GB12214/55 A GB 12214/55A GB 1221455 A GB1221455 A GB 1221455A GB 798948 A GB798948 A GB 798948A
Authority
GB
United Kingdom
Prior art keywords
sub
signal
source
carrier components
derived
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB12214/55A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB798948A publication Critical patent/GB798948A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/825—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the luminance and chrominance signals being recorded in separate channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

Abstract

798,948. Colour television. RADIO CORPORATION OF AMERICA. April 27, 1955 [May 3, 1954; May 20, 1954], No. 12214/55. Class 40 (3). Television signals including a 0-3 Mc/s. luminance signal from a source 11 and a 3.6 Mc/s. modulated colour sub-carrier from source 18 are recorded on tracks 14 and 15 of a magnetic tape 17 whilst a 2.4 Mc/s. pilot signal is added on a third track 16 and serves during reproduction to eliminate from the sub-carrier components frequency variations imparted by longitudinal speed variations in the tape motion. Before recording the sub-carrier components are reduced to a band of 2-3 Mc/s. by heterodyning in modulator stage 36 with a 6 Mc/s. signal derived by converter 39 from a 3.6 Me/s. source 38, the difference frequency components being selected by filter 37. The pilot tone is derived by a further modulator 140 as the difference between the 6 Mc/s. from converter 39 and the 3.6 Mc/s. from source 38. Signals reproduced from the tape tracks are obtained through amplifiers 27, 28, 29, the luminance signal being used directly whilst the sub-carrier components are restored to their original frequencies by heterodyning in modulator 132 with a 6 Mc/s. signal and selecting the difference frequencies by filter 134. The 6 Mc/s. signal is derived by the addition in modulator 130 of a 3.6 Mc/s. wave from source 133 with the 2.4 Mc/s. pilot signal. Since the pilot carries frequency variations imparted by the tape, the resulting 6 Mc/s. varies likewise and compensates for the corresponding variation imparted to the sub-carrier components. Figs. 1-3 (not shown) illustrate minor variations in the way in which the pilot signal is derived and the sub-carrier components are restored in reproduction. Fig. 5 (not shown) illustrates a modification in which the pilot signal is reduced to 0.8 Mc/s. and recorded on the same track as the sub-carrier components.
GB12214/55A 1954-05-03 1955-04-27 System for reproducing signals from a magnetic medium Expired GB798948A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US334173XA 1954-05-03 1954-05-03
US200554XA 1954-05-20 1954-05-20

Publications (1)

Publication Number Publication Date
GB798948A true GB798948A (en) 1958-07-30

Family

ID=26692946

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12214/55A Expired GB798948A (en) 1954-05-03 1955-04-27 System for reproducing signals from a magnetic medium

Country Status (5)

Country Link
BE (1) BE537870A (en)
CH (1) CH334173A (en)
DE (1) DE1023484B (en)
FR (1) FR1130238A (en)
GB (1) GB798948A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134743A (en) * 1982-12-29 1984-08-15 Victor Company Of Japan Color display system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL239775A (en) * 1958-06-02
DE1268184B (en) * 1958-08-04 1968-05-16 Ampex Magnetic tape apparatus for recording and reproducing broadband signals, in particular color television signals
GB964572A (en) * 1960-04-01 1964-07-22 Rank Bush Murphy Ltd Improvements in signal processing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE800157C (en) * 1949-04-10 1950-09-25 Josef Schuerer Process for synchronizing image and sound carriers when recording and playing back sound films

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134743A (en) * 1982-12-29 1984-08-15 Victor Company Of Japan Color display system

Also Published As

Publication number Publication date
BE537870A (en)
CH334173A (en) 1958-11-15
FR1130238A (en) 1957-02-01
DE1023484B (en) 1958-01-30

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